US20050001202A1 - Perylenetetracarboxylic acid dibenzimidazole sulfoderivatives containing oxo-groups in the perylene core which form part of a para-quinoid system of bonds, lyotropic liquid crystal systems and anisotropic films containing the same, and methods for making the same - Google Patents
Perylenetetracarboxylic acid dibenzimidazole sulfoderivatives containing oxo-groups in the perylene core which form part of a para-quinoid system of bonds, lyotropic liquid crystal systems and anisotropic films containing the same, and methods for making the same Download PDFInfo
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- US20050001202A1 US20050001202A1 US10/833,595 US83359504A US2005001202A1 US 20050001202 A1 US20050001202 A1 US 20050001202A1 US 83359504 A US83359504 A US 83359504A US 2005001202 A1 US2005001202 A1 US 2005001202A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
- C09K19/60—Pleochroic dyes
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
- C07D471/22—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed systems contains four or more hetero rings
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D491/00—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00
- C07D491/22—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00 in which the condensed system contains four or more hetero rings
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D495/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms
- C07D495/22—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms in which the condensed system contains four or more hetero rings
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B3/00—Dyes with an anthracene nucleus condensed with one or more carbocyclic rings
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B3/00—Dyes with an anthracene nucleus condensed with one or more carbocyclic rings
- C09B3/14—Perylene derivatives
- C09B3/18—Preparation from starting materials already containing the perylene nucleus
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/34—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring
- C09K19/3441—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having nitrogen as hetero atom
- C09K19/3477—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having nitrogen as hetero atom the heterocyclic ring being a five-membered aromatic ring containing at least one nitrogen atom
- C09K19/348—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having nitrogen as hetero atom the heterocyclic ring being a five-membered aromatic ring containing at least one nitrogen atom containing at least two nitrogen atoms
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
- C09K19/60—Pleochroic dyes
- C09K19/606—Perylene dyes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
Definitions
- the present invention relates generally to the fields of organic chemistry and optically anisotropic coatings. More specifically, the present invention relates to the synthesis of heterocyclic sulfoderivative compounds and the manufacture of optically anisotropic coatings based on these compounds.
- Organic dichroic dyes are a new class of materials gaining prominence in the manufacture of optically anisotropic films with high optical and working characteristics. Films based on these compounds are obtained through application of a layer of a liquid crystal (LC) aqueous dye solution, containing supramolecules composed of dye molecules, onto a substrate surface, followed by water evaporation. The resulting LC films acquire anisotropic properties either through preliminary mechanical ordering of the underlying substrate surface, as described in U.S. Pat. No. 2,553,961, or through subsequent application of external mechanical, electrical, magnetic or other orienting forces to the LC coating on the substrate, as described in U.S. Pat. Nos. 5,739,296 and 6,174,394. Basic properties of LC dye solutions are known in the prior art.
- LC liquid crystal
- dichroic dyes capable of forming LLC systems By using dichroic dyes capable of forming LLC systems, it is possible to obtain films possessing a high degree of optical anisotropy. Such films exhibit the properties of E-type polarizers, which are related to peculiarities of the optical absorption of supramolecular complexes, and behave as retarders (phase-shifting devices) in the spectral regions where the absorption is insignificant.
- the phase-retarding properties of these anisotropic films are related to their birefringence (double refraction), that is, a difference in refractive indices measured in the direction of application of the LLC solution onto a substrate and in the perpendicular direction. Films formed from the LLC systems based on strong (light-fast) dye molecules are characterized by high thermal stability and light resistance.
- new LLC compositions for the synthesis of optically anisotropic films can be obtained by introducing modifiers, stabilizers, surfactants, and other additives to known dyes to improve characteristics of the films. See, for example, U.S. Pat. Nos. 5,739,296 and 6,174,394.
- PTCA perylenetetracarboxylic acid
- DI perylenetetracarboxylic acid
- PTCA dibenzimidazoles and diimides are widely used as dyes and pigments in various industries due to the high chemical, thermal, and photochemical stability of these compounds. These properties also explain the increased interest in these substances as potential materials for obtaining optically anisotropic films for LCDs and other optical devices.
- the main difficulty hindering use of the above dyes is their poor solubility in water and some organic solvents.
- various substituents have been introduced into the molecules. Examples of such substituents are oxyethyl groups [see R. A. Cormier and B. A. Gregg, Phys. Chem. 101(51), 11004-11006 (1997)] and phenoxy groups [see H. Quante H. Y. Geerts, and K. Mullen, Chem. Mater. 6(2), 495-500 (1997)].
- the solubility of perylene dyes has also been increased by amino groups [see I. K. Iverson, S. M. Casey, W. Seo, and S.-W.
- the standard procedure of obtaining disulfoderivatives is as follows. To a certain volume of chlorosulfonic acid, one adds calculated amounts of PTCA DBI and oleum. Upon termination of the reaction, the mixture is colored and diluted with water. The precipitate is filtered, washed with hydrochloric acid, and dried. This yields water-soluble dibenzimidazole perylenetetracarboxydisulfonic acid, which is then dissolved in water and purified.
- An analysis of the system texture has shown that, beginning with a certain dye concentration, a stable hexagonal lyotropic mesophase is formed in a given temperature interval. Accordingly, a nematic phase is observed within a sufficiently narrow range of dye concentrations and temperatures. The boundaries of existence of isotropic phases, as well as two-phase transition regions, have been determined in this system.
- All of the aforementioned PTCA DBI sulfoderivatives are capable of forming LLC phases.
- Anisotropic films obtained using such LLC systems possess high optical characteristics and show good performance as polarizers.
- one of the main disadvantages of the known water-soluble PTCA DBI sulfoderivatives is the difficulty of obtaining related anisotropic films possessing reproducible (from batch to batch and on different substrates in the same batch) and homogeneous (over the substrate surface) properties.
- the existing film application technologies require the process parameters (concentration, temperature, etc.) to be thoroughly selected and strictly followed. However, even in cases when all the conditions of film formation are strictly obeyed, random local violation of the coating structure is still possible. This is related to a certain probability of the formation of misorientation zones and micro defects as a result of non-uniform micro and macro crystallization processes in the course of solvent removal upon LLC system application onto a substrate surface.
- LLC systems based on the known dyes are characterized by increased probability of non-uniform thickness of the applied coating, which also decreases reproducibility of the film parameters.
- the aforementioned disadvantages complicate the formation of films possessing high optical characteristics, make the technology insufficiently reproducible, and require most of the technological parameters to be thoroughly selected and strictly followed in each stage, from application to drying.
- the disclosed invention provides new water-soluble sulfoderivatives of perylenetetracarboxylic acid dibenzimidazole (PTCA DBI) and optical elements based on these compounds. It has been discovered that certain substituents, when introduced at certain positions on the PTCA DBI sulfoderivative, increase the homogeneity of the crystallization and drying processes and, thereby, increase the yield of films formed with reproducible characteristics.
- PTCA DBI perylenetetracarboxylic acid dibenzimidazole
- PTCA DBI sulfoderivatives that contain oxo-groups pendant to a perylene core which are involved in a quinoid system of bonds.
- the oxo substituted PTCA DBI sulfoderivatives are capable of forming stable LLC mesophases.
- the oxo substituted PTCA DBI sulfoderivatives can be used to obtain anisotropic, at least partially crystalline films, with reproducibly high optical characteristics. Therefore, another embodiment of the disclosed invention is the formation of anisotropic films based on the oxo substituted, PTCA DBI sulfoderivatives which can be used as polarizing films.
- the invention expands the assortment of compounds that absorb in the visible spectral range and are capable of forming stable LLC phases with increased stability.
- the invention provides new organic compounds, the LLC phases of which possess increased stability over a broad range of concentrations, temperatures, and pH values. Furthermore, the invention provides new organic compounds that simplify the process of film formation and allow the use of available commercial equipment for the application of layers, and which ensure the formation of films with reproducible parameters.
- FIG. 1 is a schematic diagram of the conversion of PTCA DBI, through oxidation, to sulfoderivatives containing oxo-groups on the perylene core that form part of a para-quinoid system of bonds.
- FIG. 2 illustrates the synthesis of PTCA DBI sulfoderivatives, which contain oxo-groups on the perylene core that form para-quinoid fragments, from PTCA hydroxyderivatives starting with 1-hydroxy PTCA.
- sulfo refers to an —SO 3 - or —SO 3 H substituent.
- PTCA DBI perylene tetracarboxylic acid dibenzimidazole
- oxo group means ⁇ O.
- perylene core means the following moiety (1) which appears, for example, within a PTCA DBI: where each R is a substituent that can be the same or different and can be fused with neighboring R group to form a bridge.
- para-quinoid or “para quinoid system of bonds” means one of the following moieties (m) or (n):
- the PTCA DBI sulfoderivatives of the present invention contain oxo-groups pendant to the perylene core.
- the oxo-groups and portions of the perylene core form a para-quinoid system of bonds.
- the oxo substituted PTCA DBI sulfoderivatives comprise, for example, any one of the general structural formulae I to VII set forth below.
- the oxo substituted PTCA DBI sulfoderivatives can be cis or trans isomers synthesized by any of the known methods.
- the oxo substituted PTCA DBI sulfoderivatives can be obtained through sulfonation of PTCA DBI under various conditions.
- the oxo substituted PTCA DBI sulfoderivatives can be obtained from PTCA hydroxy-derivatives through condensation with o-phenylenediamine or with o-phenylenediamine sulfonate, followed by oxidation and in some embodiments by further sulfonation.
- FIG. 2 schematically presents pathways for synthesizing oxo substituted PTCA DBI compounds from a PTCA hydroxyderivative of known structure.
- individual oxo substituted PTCA DBI sulfoderivatives can be obtained through fractionation of their mixtures.
- Mixtures of oxo substituted PTCA DBI sulfoderivatives can be obtained through isomerization of pure compounds.
- the oxo substituted PTCA DBI sulfoderivatives can be synthesized provided certain pre-selected conditions are obeyed. In order to obtain the target compounds, it is sufficient to determine the initial concentrations of reactants and the technological conditions of synthesis. The most significant parameters are the concentrations of initial reactants, temperature, and reaction duration. These parameters determine the result of synthesis, the product yield, and the ratio of various oxo substituted PTCA DBI derivatives (e.g., formulas I-VII) and their isomers in the reaction mass.
- Another aspect of the present invention is the development of new organic compounds whose solutions are characterized by the optimum hydrophilic-hydrophobic balance.
- This balance favorably influences the size and shape of supramolecular complexes formed in such systems, as a well as the degree of molecular order in these complexes.
- These properties provide for the required solubility of the compounds under consideration and, simultaneously, ensure high stability of the LLC phases based on these compounds.
- reproducibility of the film parameters increases and the production technology simplifies, because requirements for selecting and maintaining the optimum technological conditions on various production stages become less stringent.
- optical characteristics of the new films are improved because the planar molecules of the oxo substituted PTCA DBI sulfoderivatives are more homogeneity oriented with respect to the substrate, and the dipole moments of electron transitions (lying in the planes of molecules) are better aligned in the direction determined by external orienting factors.
- the objective of the disclosed invention is ensured by using sulfonated cis and/or trans derivatives of perylenetetracarboxylic acid dibenzimidazole containing oxo-groups in the perylene core that, together with portions of the perylene core, form a para-quinoid system of bonds.
- Illustrative compounds comprise one of the following general structural formula I-VII: where A 1 and A 2 are, independently, identical or non-identical fragments comprising the following general structural formula: where X 1 , X 3 , X 4 , X 5 , X 6 , X 7 , and X 8 are substituents selected, independently, from the group including —H, —OH, —SO 3 H, such that substituents X 6 and X 7 may interact with each other to form a bridge Z; where Z is a bridge selected from the series —O—, —SO 2 —, and —SO 2 —O—; where each Y is a substituent selected, independently, from the series —H, —Cl, —F, —Br, Alk, —OH, —OAlk, —NO 2 , and —NH 2 ; where n is an integer in the range of 0, 1, and 2, such that at least one of fragments A 1 and A 2 comprises at least one s
- All the compounds of formulas I-VII are capable of forming stable LLC phases, both individually and in admixture with other compounds of the group, as well as in admixture with other dichroic dyes capable of forming LLC phases and/or with other substances that are non-absorbing (colorless) or weakly absorbing in the visible range and capable of forming LLC phases.
- the LLC phase forms an anisotropic, at least partially crystalline, film with reproducibly high optical characteristics.
- the oxo substituted PTCA DBI sulfoderivatives exhibit, in aqueous solutions, maximum optical absorption in a wavelength interval of 530-600 nm.
- the introduction of substituents such as Cl, F, Br, Alk, and OAlk does not significantly shift the absorption band as compared to the unsubstituted molecules.
- the introduction of amino and hydroxy groups broadens the absorption band and changes the character of the absorption spectrum.
- counterions M can be represented by various cations from the series H+, NH+4, K+, Li+, Na+, Cs+, Ca++, Sr++, Mg++, Ba++, Co++, Mn++, Zn++, Cu++, Pb++, Fe++, Ni++, Al+++, Ce+++, La+++, etc., as well as by combinations of such cations.
- the oxo substituted PTCA DBI sulfoderivatives are capable of forming stable lyotropic liquid crystal systems.
- Liquid crystal solutions (systems) comprising individual oxo substituted PTCA DBI sulfoderivatives of structural formulas I-VII, as well as mixtures of such compounds, can be prepared by any conventional method.
- liquid crystal solutions (systems) of individual oxo substituted PTCA DBI sulfoderivatives of general structural formulas I-VII, as well as mixtures of such compounds, can be applied onto a substrate surface and oriented by any known method, such as the methods described in U.S. Pat. Nos. 5,739,296, 6,174,394 and 6,563,640 the disclosures of which are hereby incorporated by reference in their entirety. According to the disclosures in the aforementioned patents, the desired orientation can be provided, for example, by applying mechanical shear stress or an electric or magnetic field.
- the solution can be modified by adding plasticizing water-soluble polymers and/or anionic or non-ionic surfactants.
- the system may comprise water-soluble, low-molecular-weight additives. All additives are selected so as not to destroy the alignment properties of the liquid crystal system. Subsequent removal of the solvent from the oriented film leads to the formation of an optically anisotropic polycrystalline film with a thickness ranging from 0.2 to 1.2 microns.
- the films according to the disclosed invention are characterized by an increase in the reproducibility of the parameters from batch to batch, between different films in the same batch, and over the surface of one film, as compared to the films obtained, for example, from disulfo PTCA DBI.
- the disclosed oxo substituted PTCA DBI sulfoderivatives are capable of forming a lyotropic liquid crystal phase and can be used to obtain anisotropic films possessing highly reproducible optical characteristics.
- the disclosed oxo substituted PTCA DBI sulfoderivatives are capable of forming optically isotropic or anisotropic films.
- the disclosed oxo substituted PTCA DBI sulfoderivatives are capable of forming at least partially crystalline films.
- the films exhibit an interplanar spacing in the crystals in the range of approximately 3.1 A to 3.7 A along one of the optical axes.
- the interplanar spacing is easily fixed with standard methods, such as for example X-ray diffraction.
- the disclosed oxo substituted PTCA DBI sulfoderivatives are capable of forming polarizing and/or birefringent (double refraction) films.
- the disclosed oxo substituted PTCA DBI sulfoderivatives can be part of the composition of optically isotropic or anisotropic, polarizing and/or phase-retarding and/or birefringent films.
- the material of an optically isotropic or anisotropic film may include at least two compounds of formulae I to VII, and/or a mixture of at least two compounds of at least one of formulae I to VII, comprising at least two different substituents.
- an aqueous liquid crystal system (sometimes called a “water-based ink composition”) comprising an individual member selected from the disclosed oxo substituted PTCA DBI sulfoderivatives of structural formulae I to VII, or a mixture of at least two such compounds.
- the disclosed liquid crystal system is based on water, or a mixture of water and an organic solvent that is either miscible with water in any proportion or characterized by limited miscibility with water.
- the content of the disclosed oxo substituted PTCA DBI sulfoderivatives either individually, or in admixture, in the disclosed liquid crystal system ranges from 3 to 40 mass %, and most typically ranges from 7 to 20 mass %.
- the disclosed liquid crystal system may also comprise up to 5% mass of surfactants and/or plasticizers.
- the content of particular oxo substituted PTCA DBI sulfoderivatives in the disclosed liquid crystal system may vary, depending on the required properties, within the following limits:
- the disclosed liquid crystal system may additionally comprise at least one water-soluble organic dye or a colorless organic compound capable of participating in the formation of a lyotropic liquid crystal phase.
- the disclosed liquid crystal system may include compounds selected from two or more of formulae I to VII and/or two or more compounds selected from one of formulae I to VII that comprise at least two different substituents.
- optically anisotropic film comprising either individual oxo substituted PTCA DBI sulfoderivatives of the general structural formulas I-VII, or a mixture of such compounds.
- the optically anisotropic film may additionally comprise a different organic dye or some colorless compound.
- An optically anisotropic film according to this invention can be obtained by applying a liquid crystal system onto a substrate, followed by orienting action and drying. The anisotropic film is at least partially crystalline.
- the film material according to this invention includes at least two compounds selected from different formulae I to VII and/or at least two compounds within one of formulae I to VII comprising at least two different substituents.
- FIG. 1 and FIG. 2 present possible methods of manufacturing.
- the disclosed compounds can be manufactured by the method of sulfonation ( FIG. 1 ) and by the condensation and consequent oxidation ( FIG. 2 ).
- the experimental results set forth below present some examples of both methods of manufacture. The examples are intended for illustration purposes only, and are not intended to limit the scope of the invention.
- stage 1a The product of stage 1a (1 g) was sulfonated in 5 ml of 50% oleum for 2 hours at 50° C. and then the reaction mass was diluted with sulfuric acid and then with water to obtain 55% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 1.1 g of compounds of the structural formulas
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 726.5; mol. wt., 726.65; elemental analysis, found (%): C, 59.13; 59; 48; H, 1.87; 1.90; N, 7.51; 7.38; S, 8.66; 9.07 C 36 H 14 N 4 O 10 S 3 ; anal. calcd.
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 726.5; mol. wt., 726.65; electronic absorption spectrum (Ocean PC2000, aqueous solution) ( ⁇ max, nm): 325, 355, 375, 550.
- stage 1a The product of stage 1a (1 g) was sulfonated in 5 ml of 65% oleum for 12 hours at 65° C. and then the reaction mass was diluted with sulfuric acid and then with water to obtain 45% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 1.4 g of compounds of the structural formulas
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 789.2; mol. wt., 788.7; electronic absorption spectrum (Ocean PC2000, aqueous solution) ( ⁇ max, nm): 325, 375, 550, 590.
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 789.2; mol. wt., 788.7; elemental analysis, found (%): C, 54.22; 54; 45; H, 1.44; 1.46; N, 7.01; 7.19; S, 12.32; 12.10 C 36 H 14 N 4 O 10 S 3 ; anal. calcd.
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 789.2; mol. wt., 788.7; electronic absorption spectrum (Ocean PC2000, aqueous solution) ( ⁇ max, nm): 325, 355, 375, 550, 580.
- Trans-DBI PTCA (1 g ) was sulfonated in 100 ml of 55% oleum for 3 hours at 50° C. and then the reaction mass was diluted with sulfuric acid and with water to obtain 65% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 0.9 g of compound which has the same structure that the product from the example 1c and corresponds to the structural formula
- Trans-DBI PTCA (1 g) was sulfonated in 100 ml of 65% oleum for 12 hours at 60-55° C. and then the reaction mass was diluted with sulfuric acid and with water to obtain 65% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 1.2 g of compound of the same structure as was obtained in the example 5a.
- Cis-DBI PTCA (1 g ) was sulfonated in 30 ml of 50% oleum for 3 hours at 50-55° C. and then the reaction mass was diluted with sulfuric acid and with water to obtain 55% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 1.2 g of compound which corresponds to the products from the example 1c of the structural formula
- Cis-DBI PTCA (1 g ) was sulfonated in 50 ml of 65% oleum for 12 hours at 60-55° C. and then the reaction mass was diluted with sulfuric acid and with water to obtain 65% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 1.3 g of compound which corresponds to one of product from the example 7a.
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 567.4; mol. wt., 568.5; elemental analysis, found (%): C, 75.82; 75; 91; H, 2.94; 2.65; N, 9.61; 9.49 C 36 H 14 N 4 O 10 S 3 ; anal. calcd. for C 36 H 16 N 4 O 4 (%): C, 76.05; H, 2.84; N, 9.85; O, 11.6.
- Stage 8b Sulfonation of the Product of dihydroxyPTCADA Condensation with o-phenylenediamine
- stage 1a The product of stage 1a (1 g) was sulfonated in 5 ml of 4% oleum for 12 hours at 100° C. and then the reaction mass was diluted with 20 ml of water. The precipitate was separated by filtration and washed with acetic acid. Yield, 1 g of compounds of the structural formulas
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 729.0; mol. wt., 728.6.
- stage 8d 8b (1 g ) was charged in 20 ml of 80% oleum and stirred for 12 hours at 20° C. and then the reaction mass was diluted to 50% sulfuric acid concentration. The precipitate was separated by filtration and washed with acetic acid. Yield, 0.8 g of compounds of the structural formulas
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 758.4; mol. wt., 758.6; elemental analysis, found (%): C, 56.62; 56; 84; H, 1.94; 1.72; N, 7.34; 7.32; S, 8.32; 8.40 C 36 H 14 N 4 O 10 S 3 ; anal. calcd.
- stage 8d The product of stage 8d (1 g) was stirred in 10 ml of 80% oleum for 12 hours at 20° C. and then the reaction mass was diluted to 50% sulfuric acid concentration. The precipitate was separated by filtration and washed with acetic acid. Yield, 0.8 g of compounds of the structural formulas
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 758.4; mol. wt., 758.6; elemental analysis, found (%): C, 56.54; 56; 77; H, 1.80; 1.74; N, 7.25; 7.30; S, 8.24; 8.36 C 36 H 14 N 4 O 10 S 3 ; anal. calcd.
- Stage 8j Sulfonation of the Product of dihydroxyPTCADA Condensation with o-phenylenediamine
- stage 8e in 80% oleum was diluted to 50% oleum and heated for 10 hours at 50° C. and then was diluted with 200 ml of water. The precipitate was separated by filtration and washed with acetic acid. Yield, 1.4 g of compounds of the structural formulas
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 819.8; mol. wt., 818.7; elemental analysis, found (%): C, 52.77; 52; 80; H, 1.04; 1.26; N, 6.51; 6.49; S, 11.62; 11.40 C 36 H 14 N 4 O 10 S 3 ; anal. calcd.
- the product from the stage 8d (5.0 g), was introduced by portions into 35 ml of 10% oleum and sulfonated for 5 hours at 60° C. Then the reaction mass was sequentially diluted, first with 92% aqueous sulfuric acid to monohydrate and then with water to a sulfuric acid concentration of 65%. The precipitate was separated by filtration, triply resuspended in acetic acid, and dried to obtain 6.5 g of a compound of the structural formula
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 709.4; mol. wt., 710.65; elemental analysis, found: C, 60.66; 60.10; H, 2.09; 2.27; N, 7.39; 7.32; S, 9.51; 9.41 C 36 H 14 N 4 O 9 S 2 ; anal. calcd. for C 36 H 14 N 4 O 9 S 2 (%): C, 60.84; H, 1.99; N, 7.88; O, 20.26; S, 9.02; electronic absorption spectrum (Ocean PC2000, aqueous solution) ( ⁇ max, nm): 325, 355, 375, 600.
- stage 9a The product of stage 9a (1 g) was charged in 30 ml of 50% oleum at 50° C. and stirred at this temperature for 8 hours. Then the reaction mass was diluted to the sulfuric acid concentration 65%. The precipitate was separated by filtration and washed with acetic acid. Yield, 0.4 g of compounds of the structural formulas
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 772.0 740.6; mol. wt., 772.7; elemental analysis, found (%): C, 55.56; 55.59 58.72; 58, 10; H, 1.49; 1.43 1.54; 1.56; N, 6.98, 6.83 7.31; 7.39; S, 13.00, 13.16 8.33; 8.46 C 36 H 14 N 4 O 10 S 3 ; anal. calcd.
- the other derivatives corresponding to structures I through VI can be synthesized by analogous procedures, either through sulfonation of PTCA DBI isomers or mixtures, or by condensation of the corresponding PTCA derivatives followed by sulfonation, or by condensation of the PTCA derivatives with o-phenylenediamine sulfonate.
- a solution of 10 g of a PTCA DBI dioxodisulfonic acid (Example 1, Stage c) in 79.9 ml of deionized water was prepared by stirring at 20° C. and neutralized by ammonia to obtain 100 g of a 10% liquid crystal solution.
- This solution was applied onto a quartz glass plate with a Meyer rod No. 3 at a linear velocity of 25 mm/s. The process was conducted at a temperature of 20° C. and a relative humidity of 65%, after which the film was dried under the same conditions.
- the film was characterized by the transmission spectra measured on a Cary-500 spectrophotometer in a wavelength range from 190 to 800 nm using a light beam polarized along the direction of film application (Tpar) and in the perpendicular direction (Tper) relative to the solution application direction.
- Tpar direction of film application
- Tper perpendicular direction
- the dichroic ratio Kd log(Tper)/log(Tpar) was equal to 32; at a film transmission of 35%, the contrast ratio (CR) was 170.
- the film was characterized by the transmission spectra measured on a Cary-500 spectrophotometer in a wavelength range from 190 to 800 nm using a light beam polarized along the direction of film application (Tpar) and in the perpendicular direction (Tper) relative to the solution application direction.
- Tpar direction of film application
- Tper perpendicular direction
- the dichroic ratio Kd log(Tper)/log(Tpar) was equal to 28; at a film transmission of 36%, the contrast ratio (CR) was 150.
- a solution of 10 g of a mixture of PTCA DBI Dioxo-Disulfoderivatives (Example 1, 20 mass %), Dioxo-Sulfon-Disulfoderivatives (Example 2b, 20 mass %) and indanthrone trisulfonic acid (60 mass %) in 79.9 ml of deionized water was prepared by stirring at 20° C. and neutralized by ammonia. To this solution was added a solution of 0.1 g of sulfonol in 10 ml of water and the mixture was thoroughly stirred to obtain 100 g of a 10% liquid crystal solution. This solution was applied onto a quartz glass plate with a Meyer rod No. 3 at a linear velocity of 25 mm/s. The process was conducted at a temperature of 20° C. and a relative humidity of 65%, after which the film was dried under the same conditions.
- the film was characterized by the transmission spectra measured on a Cary-500 spectrophotometer in a wavelength range from 190 to 800 nm using a light beam polarized along the direction of film application (Tpar) and in the perpendicular direction (Tper) relative to the solution application direction.
- Tpar direction of film application
- Tper perpendicular direction
- the dichroic ratio Kd log(Tper)/log(Tpar) was equal to 35; at a film transmission of 35%, the contrast ratio (CR) was 250.
- a solution of 10 g of a mixture including PTCA DBI Dioxo-Sulfon-Disulfoderivatives (Example 2b, 40 mass %), indanthrone trisulfonic acid (40 mass %), and NTCA DBI disulfonic acid (20 mass %) in 79.9 ml of deionized water was prepared by stirring at 20° C. and neutralized by ammonia.
- a solution of 0.1 g of sulfonol in 10 ml of water was thoroughly stirred to obtain 100 g of a 10% liquid crystal solution.
- This solution was applied onto a quartz glass plate with a Meyer rod No. 3 at a linear velocity of 25 mm/s. The process was conducted at a temperature of 20° C. and a relative humidity of 65%, after which the film was dried under the same conditions.
- the film was characterized by the transmission spectra measured on a Cary-500 spectrophotometer in a wavelength range from 190 to 800 nm using a light beam polarized along the direction of film application (Tpar) and in the perpendicular direction (Tper) relative to the solution application direction.
- Tpar direction of film application
- Tper perpendicular direction
- the dichroic ratio Kd log(Tper)/log(Tpar) was equal to 34; at a film transmission of 35%, the contrast ratio (CR) was 200.
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Abstract
Description
- This U.S. non-provisional patent application claims the benefit, under 35 U.S.C. § 119(e), of U.S. provisional patent 60/482,779, filed on Jun. 25, 2003, entitled “A Lyotropic Liquid Crystal System Based On Perylenetetracarboxylic Acid Dibenzimidazole Sulfoderivatives, Containing Oxo-Groups In Perylene Core Which Are Involved In Para-Quinoid System Of Bands, Related Anisotropic Films, And Method For Making,” the entire disclosure of which is incorporated herein by reference.
- (1) Field Of The Invention
- The present invention relates generally to the fields of organic chemistry and optically anisotropic coatings. More specifically, the present invention relates to the synthesis of heterocyclic sulfoderivative compounds and the manufacture of optically anisotropic coatings based on these compounds.
- (2) Description of Related Art
- Modern technological progress requires development of optical elements based on new materials possessing specific, controllable properties. In particular, a necessary element in modern visual display systems is an optically anisotropic film with an optimum combination of optical and other characteristics for a particular device.
- Various polymeric materials are known in the prior art for use in the manufacturing of optically anisotropic films. Films based on these polymeric materials acquire anisotropic optical properties through uniaxial extension and modification with organic dyes or iodine. In most applications, the base polymer is polyvinyl alcohol (PVA). Such films are described in greater detail in the monograph Liquid Crystals: Applications and Uses, B. Bahadur (ed.), World Scientific, Singapore-New York (1990), Vol. 1, p. 101. However, the low thermal stability of PVA-based films limits their application. It is desirable to find new materials and develop methods for the synthesis of optically anisotropic films possessing improved characteristics, in particular, higher heat resistance, more convenient synthesis, and better film-forming properties.
- Organic dichroic dyes are a new class of materials gaining prominence in the manufacture of optically anisotropic films with high optical and working characteristics. Films based on these compounds are obtained through application of a layer of a liquid crystal (LC) aqueous dye solution, containing supramolecules composed of dye molecules, onto a substrate surface, followed by water evaporation. The resulting LC films acquire anisotropic properties either through preliminary mechanical ordering of the underlying substrate surface, as described in U.S. Pat. No. 2,553,961, or through subsequent application of external mechanical, electrical, magnetic or other orienting forces to the LC coating on the substrate, as described in U.S. Pat. Nos. 5,739,296 and 6,174,394. Basic properties of LC dye solutions are known in the prior art. However, extensive investigations into their application and the properties of related systems is a more recent development of the past decade. Recent studies have been motivated largely by industrial applications in liquid crystal displays (LCDs) and glazing. Dye supramolecules form a lyotropic liquid crystal (LLC) phase. In this phase, dye molecules generate supramolecular complexes having the form of columns—structural units of a mesophase. High ordering of dye molecules in the columns allows such mesophases to be used for obtaining oriented films characterized by a strong dichroism.
- Another special property of dye molecules forming supramolecular LC mesophases is the presence of peripheral groups rendering these dyes water-soluble. The mesophases of organic dyes are characterized by specific structures, phase diagrams, optical properties, and dissolving capabilities. See J. Lydon, Chromonics, Handbook of Liquid Crystals (Wiley-VCH, Weinheim, 1998), Vol. 2B, pp. 981-1007.
- By using dichroic dyes capable of forming LLC systems, it is possible to obtain films possessing a high degree of optical anisotropy. Such films exhibit the properties of E-type polarizers, which are related to peculiarities of the optical absorption of supramolecular complexes, and behave as retarders (phase-shifting devices) in the spectral regions where the absorption is insignificant. The phase-retarding properties of these anisotropic films are related to their birefringence (double refraction), that is, a difference in refractive indices measured in the direction of application of the LLC solution onto a substrate and in the perpendicular direction. Films formed from the LLC systems based on strong (light-fast) dye molecules are characterized by high thermal stability and light resistance.
- The above properties of LLC systems account for the growing interest in these materials. New methods are extensively developed for obtaining films based on such organic dyes, the progress involving both optimization of the film application conditions and the search for new LLC systems. In particular, new LLC compositions for the synthesis of optically anisotropic films can be obtained by introducing modifiers, stabilizers, surfactants, and other additives to known dyes to improve characteristics of the films. See, for example, U.S. Pat. Nos. 5,739,296 and 6,174,394.
- In recent years, there has been increasing demand for films possessing high optical anisotropy, characterized by improved selectivity in various wavelength ranges. Films with different positions of the absorption maximum, variable in a wide spectral range from infrared (IR) to ultraviolet (UV) regions, are needed. This has led to the development of an expanded assortment of compounds capable of forming LLC phases and films possessing the required properties. However, the number of dyes known to form stable lyotropic mesophases is still relatively small. Naturally, each new liquid-crystal dye becomes the object of thorough investigation.
- Among water-soluble dichroic dyes capable of forming stable LLC phases, applicable in the manufacturing of optically anisotropic films, an important place belongs to disulfoderivatives of various organic dyes, including perylenetetracarboxylic acid (PTCA) dibenzimidazole (DBI) described in U.S. Pat. Nos. 5,739,296 and 6,174,394. PTCA dibenzimidazoles and diimides are widely used as dyes and pigments in various industries due to the high chemical, thermal, and photochemical stability of these compounds. These properties also explain the increased interest in these substances as potential materials for obtaining optically anisotropic films for LCDs and other optical devices.
- The main difficulty hindering use of the above dyes is their poor solubility in water and some organic solvents. In order to provide the dyes with sufficient solubility in organic solvents, various substituents have been introduced into the molecules. Examples of such substituents are oxyethyl groups [see R. A. Cormier and B. A. Gregg, Phys. Chem. 101(51), 11004-11006 (1997)] and phenoxy groups [see H. Quante H. Y. Geerts, and K. Mullen, Chem. Mater. 6(2), 495-500 (1997)]. The solubility of perylene dyes has also been increased by amino groups [see I. K. Iverson, S. M. Casey, W. Seo, and S.-W. Tam-Chang, Langmuir 18(9), 3510-5316 (2002)] and sulfonic groups [see U.S. Pat. Nos. 5,739,296 and 6,174,394]. The best results were obtained with sulfonic groups, which provided for sufficient solubility and the formation of a stable LLC phase of perylene dyes.
- The standard procedure of obtaining disulfoderivatives is as follows. To a certain volume of chlorosulfonic acid, one adds calculated amounts of PTCA DBI and oleum. Upon termination of the reaction, the mixture is colored and diluted with water. The precipitate is filtered, washed with hydrochloric acid, and dried. This yields water-soluble dibenzimidazole perylenetetracarboxydisulfonic acid, which is then dissolved in water and purified. An analysis of the system texture has shown that, beginning with a certain dye concentration, a stable hexagonal lyotropic mesophase is formed in a given temperature interval. Accordingly, a nematic phase is observed within a sufficiently narrow range of dye concentrations and temperatures. The boundaries of existence of isotropic phases, as well as two-phase transition regions, have been determined in this system.
- Various dye compositions (inks) for the obtaining of polarizer films, based on PTCA DBI sulfoderivatives, have been described in patents. In particular, dyes having the following structural formula are known:
where
R=H, alkyl group, halogen or alkoxy group; and Ar is a substituted or nonsubstituted aryl radical. Such dyes, which are selective in the region of 550-600 nm, are described in U.S. Pat. No. 5,739,296. -
- LC blends of PTCA DBI sulfoderivatives where various modifying additives are introduced to improve the characteristics of anisotropic films are described in U.S. Pat. Nos. 5,739,296 and 6,174,394. Indanthrone disulfoderivatives with various substituents are described in U.S. Pat. Nos. 5,739,296 and 6,174,394. Compositions with various organic cations are described in published patent application EP 961138.
- Thin anisotropic films obtained using LLC systems based on sulfoderivatives of various organic dyes, including perylene dyes, have been characterized with respect to their properties and structures. In particular, the properties of films obtained using perylene dye based LLC systems have been studied. See I. K. Iverson, S. M. Casey, W. Seo, and S.-W. Tam-Chang, Controlling Molecular Orientation in Solid-Crystalline Phase, Langmuir 18(9), 3510-3516 (2002). All films were reported to possess a high degree of optical anisotropy.
- The properties of thin anisotropic films obtained using an LLC system based on sulfoderivatives of organic dyes has been reported. See T. Fiske, L. Ignatov, P. Lazarev, V. Nazarov, M. Paukshto, Molecular Alignment in Crystal Polarizers and Retarders, Society for Information Display, Int. Symp. Digest of Technical Papers (Boston, Mass., May 19-24, 2002), p. 566-569. It was established that these films possess at least a partially crystalline structure. Optically anisotropic films can be obtained on substrates of glass, plastic, or any other material. The Violet dye used for the formation of these anisotropic films represents a blend of cis and trans isomers. See V. Nazarov, L. Ignatov, K. Kienskaya, Electronic Spectra of Aqueous Solutions and Films Made of Liquid Crystal Ink for Thin Film Polarizers, Mol. Mater. 14(2), 153-163 (2001). Possessing high optical characteristics, with a dichroic ratio reaching 25-30, these films can be used as polarizers. See Y. Bobrov, L. Blinov, L. Ignatov, G. King, V. Lazarev, Y.-D. Ma, V. Nazarov, E. Neburchilova, N. Ovchinnikova, S. Remizov, Environmental and Optical Testing of Optiva Thin Crystal Film™ Polarizers, Proceedings of the 10 th SID Symposium “Advanced display technologies”, (Minsk, Republic of Belarus, Sep. 18-21, 2001), p. 23-30.
- Methods for obtaining of such films, including those with high degree of crystallinity, are described in PCT Publication WO 02/063,660.
- All of the aforementioned PTCA DBI sulfoderivatives are capable of forming LLC phases. Anisotropic films obtained using such LLC systems possess high optical characteristics and show good performance as polarizers.
- However, one of the main disadvantages of the known water-soluble PTCA DBI sulfoderivatives is the difficulty of obtaining related anisotropic films possessing reproducible (from batch to batch and on different substrates in the same batch) and homogeneous (over the substrate surface) properties. The existing film application technologies require the process parameters (concentration, temperature, etc.) to be thoroughly selected and strictly followed. However, even in cases when all the conditions of film formation are strictly obeyed, random local violation of the coating structure is still possible. This is related to a certain probability of the formation of misorientation zones and micro defects as a result of non-uniform micro and macro crystallization processes in the course of solvent removal upon LLC system application onto a substrate surface. In addition, LLC systems based on the known dyes are characterized by increased probability of non-uniform thickness of the applied coating, which also decreases reproducibility of the film parameters. The aforementioned disadvantages complicate the formation of films possessing high optical characteristics, make the technology insufficiently reproducible, and require most of the technological parameters to be thoroughly selected and strictly followed in each stage, from application to drying.
- The disclosed invention provides new water-soluble sulfoderivatives of perylenetetracarboxylic acid dibenzimidazole (PTCA DBI) and optical elements based on these compounds. It has been discovered that certain substituents, when introduced at certain positions on the PTCA DBI sulfoderivative, increase the homogeneity of the crystallization and drying processes and, thereby, increase the yield of films formed with reproducible characteristics.
- Specifically, in one embodiment, PTCA DBI sulfoderivatives are disclosed that contain oxo-groups pendant to a perylene core which are involved in a quinoid system of bonds. The oxo substituted PTCA DBI sulfoderivatives are capable of forming stable LLC mesophases.
- The oxo substituted PTCA DBI sulfoderivatives can be used to obtain anisotropic, at least partially crystalline films, with reproducibly high optical characteristics. Therefore, another embodiment of the disclosed invention is the formation of anisotropic films based on the oxo substituted, PTCA DBI sulfoderivatives which can be used as polarizing films. The invention expands the assortment of compounds that absorb in the visible spectral range and are capable of forming stable LLC phases with increased stability.
- Accordingly, the invention provides new organic compounds, the LLC phases of which possess increased stability over a broad range of concentrations, temperatures, and pH values. Furthermore, the invention provides new organic compounds that simplify the process of film formation and allow the use of available commercial equipment for the application of layers, and which ensure the formation of films with reproducible parameters.
-
FIG. 1 is a schematic diagram of the conversion of PTCA DBI, through oxidation, to sulfoderivatives containing oxo-groups on the perylene core that form part of a para-quinoid system of bonds. -
FIG. 2 illustrates the synthesis of PTCA DBI sulfoderivatives, which contain oxo-groups on the perylene core that form para-quinoid fragments, from PTCA hydroxyderivatives starting with 1-hydroxy PTCA. - As used herein, the following terms have the following meanings:
- The phrases “sulfonated” and “sulfoderivative” refer to the presence of one or more sulfo substituents.
- The word “sulfo” refers to an —SO3- or —SO3H substituent.
- The phrase “perylene tetracarboxylic acid dibenzimidazole,” abbreviated PTCA DBI, means one of the following structures (A) or (B):
where each R is a substituent that can be the same or different and can be fused with a neighboring R group to form a bridge and where x and y are integers ranging from 1 to 4. - The phrase oxo group means ═O.
-
-
- The PTCA DBI sulfoderivatives of the present invention contain oxo-groups pendant to the perylene core. The oxo-groups and portions of the perylene core form a para-quinoid system of bonds. The oxo substituted PTCA DBI sulfoderivatives comprise, for example, any one of the general structural formulae I to VII set forth below.
- The oxo substituted PTCA DBI sulfoderivatives can be cis or trans isomers synthesized by any of the known methods. In particular, as illustrated in
FIG. 1 , the oxo substituted PTCA DBI sulfoderivatives can be obtained through sulfonation of PTCA DBI under various conditions. - In addition, the oxo substituted PTCA DBI sulfoderivatives can be obtained from PTCA hydroxy-derivatives through condensation with o-phenylenediamine or with o-phenylenediamine sulfonate, followed by oxidation and in some embodiments by further sulfonation.
FIG. 2 schematically presents pathways for synthesizing oxo substituted PTCA DBI compounds from a PTCA hydroxyderivative of known structure. - Alternatively, individual oxo substituted PTCA DBI sulfoderivatives can be obtained through fractionation of their mixtures.
- Mixtures of oxo substituted PTCA DBI sulfoderivatives can be obtained through isomerization of pure compounds.
- The oxo substituted PTCA DBI sulfoderivatives, including those of the general structural formulae I to VII set forth below, can be synthesized provided certain pre-selected conditions are obeyed. In order to obtain the target compounds, it is sufficient to determine the initial concentrations of reactants and the technological conditions of synthesis. The most significant parameters are the concentrations of initial reactants, temperature, and reaction duration. These parameters determine the result of synthesis, the product yield, and the ratio of various oxo substituted PTCA DBI derivatives (e.g., formulas I-VII) and their isomers in the reaction mass.
- Another aspect of the present invention is the development of new organic compounds whose solutions are characterized by the optimum hydrophilic-hydrophobic balance. This balance favorably influences the size and shape of supramolecular complexes formed in such systems, as a well as the degree of molecular order in these complexes. These properties provide for the required solubility of the compounds under consideration and, simultaneously, ensure high stability of the LLC phases based on these compounds. As a result, reproducibility of the film parameters increases and the production technology simplifies, because requirements for selecting and maintaining the optimum technological conditions on various production stages become less stringent. In addition, optical characteristics of the new films are improved because the planar molecules of the oxo substituted PTCA DBI sulfoderivatives are more homogeneity oriented with respect to the substrate, and the dipole moments of electron transitions (lying in the planes of molecules) are better aligned in the direction determined by external orienting factors.
- The above objectives are achieved using the disclosed water-soluble oxo substituted PTCA DBI sulfoderivatives, which are original compounds not previously described in the literature. The technical result is ensured by using chemical compounds characterized by the disclosed structural formula, liquid crystal systems based on these compounds, and optical anisotropic films manufactured using this system.
- The objective of the disclosed invention is ensured by using sulfonated cis and/or trans derivatives of perylenetetracarboxylic acid dibenzimidazole containing oxo-groups in the perylene core that, together with portions of the perylene core, form a para-quinoid system of bonds. Illustrative compounds comprise one of the following general structural formula I-VII:
where A1 and A2 are, independently, identical or non-identical fragments comprising the following general structural formula:
where X1, X3, X4, X5, X6, X7, and X8 are substituents selected, independently, from the group including —H, —OH, —SO3H, such that substituents X6 and X7 may interact with each other to form a bridge Z; where Z is a bridge selected from the series —O—, —SO2—, and —SO2—O—; where each Y is a substituent selected, independently, from the series —H, —Cl, —F, —Br, Alk, —OH, —OAlk, —NO2, and —NH2; where n is an integer in the range of 0, 1, and 2, such that at least one of fragments A1 and A2 comprises at least one sulfo group; where p is an integer in the range of 0, 1, 2, 3 and 4; where each M is counterion; where j is the number of counterions in the dye molecule, which can be fractional if one or more counterions belong to several molecules; and where, when n>1, different counterions M can be involved. - All the compounds of formulas I-VII are capable of forming stable LLC phases, both individually and in admixture with other compounds of the group, as well as in admixture with other dichroic dyes capable of forming LLC phases and/or with other substances that are non-absorbing (colorless) or weakly absorbing in the visible range and capable of forming LLC phases. After removal of the solvent, the LLC phase forms an anisotropic, at least partially crystalline, film with reproducibly high optical characteristics.
- The oxo substituted PTCA DBI sulfoderivatives exhibit, in aqueous solutions, maximum optical absorption in a wavelength interval of 530-600 nm. The introduction of substituents such as Cl, F, Br, Alk, and OAlk does not significantly shift the absorption band as compared to the unsubstituted molecules. The introduction of amino and hydroxy groups broadens the absorption band and changes the character of the absorption spectrum. By varying the number of sulfonic groups and the number and character of substituents in the oxo substituted PTCA DBI sulfoderivative, it is possible to control the hydrophilic-hydrophobic balance of molecular aggregates formed in LLC solutions and to change the solution viscosity. The technical result of the invention is achieved irrespective of the number and types of substituents indicated in the structures I-VII.
- In structures I-VII, counterions M can be represented by various cations from the series H+, NH+4, K+, Li+, Na+, Cs+, Ca++, Sr++, Mg++, Ba++, Co++, Mn++, Zn++, Cu++, Pb++, Fe++, Ni++, Al+++, Ce+++, La+++, etc., as well as by combinations of such cations.
- The oxo substituted PTCA DBI sulfoderivatives are capable of forming stable lyotropic liquid crystal systems. Liquid crystal solutions (systems) comprising individual oxo substituted PTCA DBI sulfoderivatives of structural formulas I-VII, as well as mixtures of such compounds, can be prepared by any conventional method.
- The liquid crystal solutions (systems) of individual oxo substituted PTCA DBI sulfoderivatives of general structural formulas I-VII, as well as mixtures of such compounds, can be applied onto a substrate surface and oriented by any known method, such as the methods described in U.S. Pat. Nos. 5,739,296, 6,174,394 and 6,563,640 the disclosures of which are hereby incorporated by reference in their entirety. According to the disclosures in the aforementioned patents, the desired orientation can be provided, for example, by applying mechanical shear stress or an electric or magnetic field. For better substrate wetting and optimization of the rheological properties of a liquid crystal system, the solution can be modified by adding plasticizing water-soluble polymers and/or anionic or non-ionic surfactants. In addition, the system may comprise water-soluble, low-molecular-weight additives. All additives are selected so as not to destroy the alignment properties of the liquid crystal system. Subsequent removal of the solvent from the oriented film leads to the formation of an optically anisotropic polycrystalline film with a thickness ranging from 0.2 to 1.2 microns.
- The films according to the disclosed invention are characterized by an increase in the reproducibility of the parameters from batch to batch, between different films in the same batch, and over the surface of one film, as compared to the films obtained, for example, from disulfo PTCA DBI.
- Thus, the disclosed oxo substituted PTCA DBI sulfoderivatives are capable of forming a lyotropic liquid crystal phase and can be used to obtain anisotropic films possessing highly reproducible optical characteristics.
- The disclosed oxo substituted PTCA DBI sulfoderivatives are capable of forming optically isotropic or anisotropic films.
- The disclosed oxo substituted PTCA DBI sulfoderivatives are capable of forming at least partially crystalline films. The films exhibit an interplanar spacing in the crystals in the range of approximately 3.1 A to 3.7 A along one of the optical axes. The interplanar spacing is easily fixed with standard methods, such as for example X-ray diffraction.
- The disclosed oxo substituted PTCA DBI sulfoderivatives are capable of forming polarizing and/or birefringent (double refraction) films.
- The disclosed oxo substituted PTCA DBI sulfoderivatives can be part of the composition of optically isotropic or anisotropic, polarizing and/or phase-retarding and/or birefringent films. The material of an optically isotropic or anisotropic film may include at least two compounds of formulae I to VII, and/or a mixture of at least two compounds of at least one of formulae I to VII, comprising at least two different substituents.
- The technical result of the disclosed invention is also obtained an aqueous liquid crystal system (sometimes called a “water-based ink composition”) comprising an individual member selected from the disclosed oxo substituted PTCA DBI sulfoderivatives of structural formulae I to VII, or a mixture of at least two such compounds. The disclosed liquid crystal system is based on water, or a mixture of water and an organic solvent that is either miscible with water in any proportion or characterized by limited miscibility with water. The content of the disclosed oxo substituted PTCA DBI sulfoderivatives either individually, or in admixture, in the disclosed liquid crystal system ranges from 3 to 40 mass %, and most typically ranges from 7 to 20 mass %. The disclosed liquid crystal system may also comprise up to 5% mass of surfactants and/or plasticizers.
- The content of particular oxo substituted PTCA DBI sulfoderivatives in the disclosed liquid crystal system may vary, depending on the required properties, within the following limits:
-
- compounds of formulas I and/or V, from 0 to 99 mass %, most favorably within 0-70 mass %;
- compounds of formula II and/or VI, from 0 to 99 mass %, most favorably within 0-50 mass %;
- compounds of formula IV and/or VII, from 0 to 50 mass %, most favorably within 0-20 mass %;
- compounds of formula III, from 0 to 99 mass %, most favorably within 0-20 mass %.
- The disclosed liquid crystal system may additionally comprise at least one water-soluble organic dye or a colorless organic compound capable of participating in the formation of a lyotropic liquid crystal phase.
- The disclosed liquid crystal system may include compounds selected from two or more of formulae I to VII and/or two or more compounds selected from one of formulae I to VII that comprise at least two different substituents.
- The technical result of the disclosed invention is also obtained by an optically anisotropic film comprising either individual oxo substituted PTCA DBI sulfoderivatives of the general structural formulas I-VII, or a mixture of such compounds. The optically anisotropic film may additionally comprise a different organic dye or some colorless compound. An optically anisotropic film according to this invention can be obtained by applying a liquid crystal system onto a substrate, followed by orienting action and drying. The anisotropic film is at least partially crystalline.
- The film material according to this invention includes at least two compounds selected from different formulae I to VII and/or at least two compounds within one of formulae I to VII comprising at least two different substituents.
-
FIG. 1 andFIG. 2 present possible methods of manufacturing. The disclosed compounds can be manufactured by the method of sulfonation (FIG. 1 ) and by the condensation and consequent oxidation (FIG. 2 ). The experimental results set forth below present some examples of both methods of manufacture. The examples are intended for illustration purposes only, and are not intended to limit the scope of the invention. - A suspension of 1 g of monohydroxyPTCADA prepared by the known way (see J. Org. Chem., USSR, 1972, VIII, 369) and 1.6 g of o-phenylenediamine in 30 ml of ethylene glycol was heated at 90° C. for 10 hours. The precipitate was separated by filtration and washed with ethanol. Yield, 1.3 g of compounds of the structural formulas
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 551.7; mol. wt., 552.54.
- The product of stage 1a (1 g) was sulfonated in 5 ml of 50% oleum for 2 hours at 50° C. and then the reaction mass was diluted with sulfuric acid and then with water to obtain 55% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 1.1 g of compounds of the structural formulas
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 726.2; mol. wt., 726.65.
-
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 726.5; mol. wt., 726.65; elemental analysis, found (%): C, 59.13; 59; 48; H, 1.87; 1.90; N, 7.51; 7.38; S, 8.66; 9.07 C36H14N4O10S3; anal. calcd. for C36H14N4O10S2 (%): C, 59.50; H, 1.94; N, 7.71; O, 22.02; S, 8.83; IR spectrum (FSM-1201 Fourier-transform IR spectrometer, thin film on KRS-5 window) (ν, cm-1): 1229.0, 1179.7 (sulfonic groups), 1073.6, 1033.2 (sulfonic groups), 1670.6 (carbonyl); electronic absorption spectrum (Ocean PC2000, aqueous solution) (λmax, nm): 325, 375, 540.
-
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 726.5; mol. wt., 726.65; electronic absorption spectrum (Ocean PC2000, aqueous solution) (λmax, nm): 325, 355, 375, 550.
- The product of stage 1a (1 g) was sulfonated in 5 ml of 65% oleum for 12 hours at 65° C. and then the reaction mass was diluted with sulfuric acid and then with water to obtain 45% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 1.4 g of compounds of the structural formulas
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 789.2; mol. wt., 788.7; electronic absorption spectrum (Ocean PC2000, aqueous solution) (λmax, nm): 325, 375, 550, 590.
-
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 789.2; mol. wt., 788.7; elemental analysis, found (%): C, 54.22; 54; 45; H, 1.44; 1.46; N, 7.01; 7.19; S, 12.32; 12.10 C36H14N4O10S3; anal. calcd. for C36H12N4O12S3 (%): C, 54.82; H, 1.53; N, 7.10; O, 24.34; S, 12.20; IR spectrum (FSM-1201 Fourier-transform IR spectrometer, thin film on KRS-5 window) (ν, cm-1): 1228.9, 1179.4 (sulfonic groups), 1074.0, 1027.0 (sulfonic groups), 1324.0 (sulfone), 1699.6 (carbonyl); electronic absorption spectrum (Ocean PC2000, aqueous solution) (λmax, nm): 325, 375, 540, 600.
-
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 789.2; mol. wt., 788.7; electronic absorption spectrum (Ocean PC2000, aqueous solution) (λmax, nm): 325, 355, 375, 550, 580.
-
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 711.4; mol. wt., 712.67.
- A mixture of monohydroxyPTCADBI (1 g) was heated in 30 ml of 65% oleum at 50° C. for 8 h. Then the reaction mass was diluted with sulfuric acid and with water to obtain 55% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 1.4 g of compounds similar to the product from the example 2a of the structural formulas
- Trans-DBI PTCA (1 g ) was sulfonated in 100 ml of 55% oleum for 3 hours at 50° C. and then the reaction mass was diluted with sulfuric acid and with water to obtain 65% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 0.9 g of compound which has the same structure that the product from the example 1c and corresponds to the structural formula
- The product of example 4 (1 g) was sulfonated in 50 ml of 65% oleum for 10 hours at 65° C. and then the reaction mass was diluted with sulfuric acid and then with water to obtain 45% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 1 g of compounds which has the same structure that the product from the example 2b and corresponds to the structural formula
- Trans-DBI PTCA (1 g) was sulfonated in 100 ml of 65% oleum for 12 hours at 60-55° C. and then the reaction mass was diluted with sulfuric acid and with water to obtain 65% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 1.2 g of compound of the same structure as was obtained in the example 5a.
- Cis-DBI PTCA (1 g ) was sulfonated in 30 ml of 50% oleum for 3 hours at 50-55° C. and then the reaction mass was diluted with sulfuric acid and with water to obtain 55% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 1.2 g of compound which corresponds to the products from the example 1c of the structural formula
- The product of example 6 (1 g) was sulfonated in 50 ml of 65% oleum for 10 hours at 65° C. and then the reaction mass was diluted with sulfuric acid and then with water to obtain 45% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 1 g of compounds which corresponds to the product from the example 2b of the structural formula
- Cis-DBI PTCA (1 g ) was sulfonated in 50 ml of 65% oleum for 12 hours at 60-55° C. and then the reaction mass was diluted with sulfuric acid and with water to obtain 65% sulfuric acid. The precipitate was separated by filtration and washed with acetic acid. Yield, 1.3 g of compound which corresponds to one of product from the example 7a.
-
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 567.4; mol. wt., 568.5; elemental analysis, found (%): C, 75.82; 75; 91; H, 2.94; 2.65; N, 9.61; 9.49 C36H14N4O10S3; anal. calcd. for C36H16N4O4 (%): C, 76.05; H, 2.84; N, 9.85; O, 11.6.
-
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 729.0; mol. wt., 728.6.
- The product of stage 8d 8b (1 g ) was charged in 20 ml of 80% oleum and stirred for 12 hours at 20° C. and then the reaction mass was diluted to 50% sulfuric acid concentration. The precipitate was separated by filtration and washed with acetic acid. Yield, 0.8 g of compounds of the structural formulas
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 758.4; mol. wt., 758.6; elemental analysis, found (%): C, 56.62; 56; 84; H, 1.94; 1.72; N, 7.34; 7.32; S, 8.32; 8.40 C36H14N4O10S3; anal. calcd. for C36H14N4O12S2 (%): C, 56.99; H, 1.86; N, 7.39; O, 25.31; S, 8.45; IR spectrum (FSM-1201 Fourier-transform IR spectrometer, thin film on KRS-5 window) (ν, cm-1): 1230.4, 1180.5 (sulfonic groups), 1074.0, 1030.5 (sulfonic groups), 1700.9 (carbonyl); electronic absorption spectrum (Ocean PC2000, aqueous solution) (λmax, nm): 560.
-
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 567.4; mol. wt., 568.5.
-
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 758.4; mol. wt., 758.6; elemental analysis, found (%): C, 56.54; 56; 77; H, 1.80; 1.74; N, 7.25; 7.30; S, 8.24; 8.36 C36H14N4O10S3; anal. calcd. for C36H14N4O12S2 (%): C, 56.99; H, 1.86; N, 7.39; O, 25.31; S, 8.45; IR spectrum (FSM-1201 Fourier-transform IR spectrometer, thin film on KRS-5 window) (ν, cm-1): 1230.4, 1180.5 (sulfonic groups), 1074.0, 1030.5 (sulfonic groups), 1700.9 (carbonyl); electronic absorption spectrum (Ocean PC2000, aqueous solution) (λmax, nm): 560.
-
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 819.8; mol. wt., 818.7; elemental analysis, found (%): C, 52.77; 52; 80; H, 1.04; 1.26; N, 6.51; 6.49; S, 11.62; 11.40 C36H14N4O10S3; anal. calcd. for C36H10N4O14S3 (%): C, 52.81; H, 1.23; N, 6.84; O, 27.36; S, 11.75; IR spectrum (FSM-1201 Fourier-transform IR spectrometer, thin film on KRS-5 window) (ν, cm-1): 1230.4, 1180.5 (sulfonic groups), 1074.0, 1030.5 (sulfonic groups), 1330.0 (sulfone), 1700.6 (carbonyl); electronic absorption spectrum (Ocean PC2000, aqueous solution) (λmax, nm): 560, 675.
- The product from the stage 8d (5.0 g), was introduced by portions into 35 ml of 10% oleum and sulfonated for 5 hours at 60° C. Then the reaction mass was sequentially diluted, first with 92% aqueous sulfuric acid to monohydrate and then with water to a sulfuric acid concentration of 65%. The precipitate was separated by filtration, triply resuspended in acetic acid, and dried to obtain 6.5 g of a compound of the structural formula
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 709.4; mol. wt., 710.65; elemental analysis, found: C, 60.66; 60.10; H, 2.09; 2.27; N, 7.39; 7.32; S, 9.51; 9.41 C36H14N4O9S2; anal. calcd. for C36H14N4O9S2 (%): C, 60.84; H, 1.99; N, 7.88; O, 20.26; S, 9.02; electronic absorption spectrum (Ocean PC2000, aqueous solution) (λmax, nm): 325, 355, 375, 600.
- The product of stage 9a (1 g) was charged in 30 ml of 50% oleum at 50° C. and stirred at this temperature for 8 hours. Then the reaction mass was diluted to the
sulfuric acid concentration 65%. The precipitate was separated by filtration and washed with acetic acid. Yield, 0.4 g of compounds of the structural formulas -
- Mass spectrum (VISION 2000, negative reflection mode): m/z, 772.0 740.6; mol. wt., 772.7; elemental analysis, found (%): C, 55.56; 55.59 58.72; 58, 10; H, 1.49; 1.43 1.54; 1.56; N, 6.98, 6.83 7.31; 7.39; S, 13.00, 13.16 8.33; 8.46 C36H14N4O10S3; anal. calcd. for C36H12N4O11S3 (%): C, 55.96 58.38; H, 1.57 1.63; N, 7.25 7.5; O, 22.78 23.76; S, 12.45 8.66; IR spectrum (FSM-1201 Fourier-transform IR spectrometer, thin film on KRS-5 window) (ν, cm-1): 1230.0, 1182.2 (sulfonic groups), 1072.0, 1030.5 (sulfonic groups), 1324.0 (sulfone), 1700.0 (carbonyl); electronic absorption spectrum (Ocean PC2000, aqueous solution) (λmax, nm): 325, 375, 540 for the first fraction and 325, 355, 375, 535 for the second one.
- The other derivatives corresponding to structures I through VI can be synthesized by analogous procedures, either through sulfonation of PTCA DBI isomers or mixtures, or by condensation of the corresponding PTCA derivatives followed by sulfonation, or by condensation of the PTCA derivatives with o-phenylenediamine sulfonate.
- A solution of 10 g of a PTCA DBI dioxodisulfonic acid (Example 1, Stage c) in 79.9 ml of deionized water was prepared by stirring at 20° C. and neutralized by ammonia to obtain 100 g of a 10% liquid crystal solution. This solution was applied onto a quartz glass plate with a Meyer rod No. 3 at a linear velocity of 25 mm/s. The process was conducted at a temperature of 20° C. and a relative humidity of 65%, after which the film was dried under the same conditions.
- The film was characterized by the transmission spectra measured on a Cary-500 spectrophotometer in a wavelength range from 190 to 800 nm using a light beam polarized along the direction of film application (Tpar) and in the perpendicular direction (Tper) relative to the solution application direction. At a wavelength of λ=540 nm corresponding to maximum absorption, the dichroic ratio Kd=log(Tper)/log(Tpar) was equal to 32; at a film transmission of 35%, the contrast ratio (CR) was 170.
- A solution of 10 g of a mixture of PTCA DBI sulfoderivatives, including Dioxo-Disulfoderivative (Example 1, 30 mass %), Dioxo-Sulfon-Disulfoderivatives (Example 2b, 30 mass %), Tetraoxo-Disulfoderivatives (Example 8e, 20 mass %, Example 8j, 20 mass % ) and in 79.9 ml of deionized water was prepared by stirring at 20° C. and neutralized by ammonia. To this solution was added a solution of 0.1 g of sulfonol in 10 ml of water and the mixture was thoroughly stirred to obtain 100 g of a 10% liquid crystal solution. This solution was applied onto a quartz glass plate with a Meyer rod No. 3 at a linear velocity of 25 mm/s. The process was conducted at a temperature of 20° C. and a relative humidity of 65%, after which the film was dried under the same conditions.
- The film was characterized by the transmission spectra measured on a Cary-500 spectrophotometer in a wavelength range from 190 to 800 nm using a light beam polarized along the direction of film application (Tpar) and in the perpendicular direction (Tper) relative to the solution application direction. At a wavelength of λ=540 nm corresponding to maximum absorption, the dichroic ratio Kd=log(Tper)/log(Tpar) was equal to 28; at a film transmission of 36%, the contrast ratio (CR) was 150.
- A solution of 10 g of a mixture of PTCA DBI Dioxo-Disulfoderivatives (Example 1, 20 mass %), Dioxo-Sulfon-Disulfoderivatives (Example 2b, 20 mass %) and indanthrone trisulfonic acid (60 mass %) in 79.9 ml of deionized water was prepared by stirring at 20° C. and neutralized by ammonia. To this solution was added a solution of 0.1 g of sulfonol in 10 ml of water and the mixture was thoroughly stirred to obtain 100 g of a 10% liquid crystal solution. This solution was applied onto a quartz glass plate with a Meyer rod No. 3 at a linear velocity of 25 mm/s. The process was conducted at a temperature of 20° C. and a relative humidity of 65%, after which the film was dried under the same conditions.
- The film was characterized by the transmission spectra measured on a Cary-500 spectrophotometer in a wavelength range from 190 to 800 nm using a light beam polarized along the direction of film application (Tpar) and in the perpendicular direction (Tper) relative to the solution application direction. At a wavelength of λ=650 nm corresponding to maximum absorption, the dichroic ratio Kd=log(Tper)/log(Tpar) was equal to 35; at a film transmission of 35%, the contrast ratio (CR) was 250.
- A solution of 10 g of a mixture including PTCA DBI Dioxo-Sulfon-Disulfoderivatives (Example 2b, 40 mass %), indanthrone trisulfonic acid (40 mass %), and NTCA DBI disulfonic acid (20 mass %) in 79.9 ml of deionized water was prepared by stirring at 20° C. and neutralized by ammonia. To this solution was added a solution of 0.1 g of sulfonol in 10 ml of water and the mixture was thoroughly stirred to obtain 100 g of a 10% liquid crystal solution. This solution was applied onto a quartz glass plate with a Meyer rod No. 3 at a linear velocity of 25 mm/s. The process was conducted at a temperature of 20° C. and a relative humidity of 65%, after which the film was dried under the same conditions.
- The film was characterized by the transmission spectra measured on a Cary-500 spectrophotometer in a wavelength range from 190 to 800 nm using a light beam polarized along the direction of film application (Tpar) and in the perpendicular direction (Tper) relative to the solution application direction. At a wavelength of λ=650 nm corresponding to maximum absorption, the dichroic ratio Kd=log(Tper)/log(Tpar) was equal to 34; at a film transmission of 35%, the contrast ratio (CR) was 200.
- All compounds characterized by the structural formula I through VI give stable lyotropic liquid crystal systems which can be used for obtaining optically anisotropic films with high performance characteristics and high reproducibility. The above examples are illustrative and are should not be interpreted as limiting the scope of the present invention.
Claims (27)
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US10/833,595 US7025900B2 (en) | 2003-06-25 | 2004-04-27 | Perylenetetracarboxylic acid dibenzimidazole sulfoderivatives containing oxo-groups in the perylene core which form part of a para-quinoid system of bonds, lyotropic liquid crystal systems and anisotropic films containing the same, and methods for making the same |
KR1020057024797A KR100837946B1 (en) | 2003-06-25 | 2004-06-24 | Perylenetetracarboxylic acid dibenzimidazole sulfoderivatives containing oxo-groups in the perylene core which form part of a para-quinoid system of bonds, lyotropic liquid crystal systems and anisotropic films containning the same, and methods for making the same |
PCT/US2004/020699 WO2005003132A1 (en) | 2003-06-25 | 2004-06-24 | Perylenetetracarboxylic acid dibenzimidazole sulfoderivatives containing oxo-groups in the perylene core which form part of a para-quinoid system of bonds, lyotropic liquid crystal systems and anisotropic films containing the same, and methods for making the same |
JP2006533823A JP4429317B2 (en) | 2003-06-25 | 2004-06-24 | Sulfo derivatives of perylene tetracarboxylic acid dibenzimidazole containing oxo group of perylene nucleus forming part of para-quinoid bond, lyotropic liquid crystal system and anisotropic film containing the same, and production method thereof |
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